Patient demographics
| Patient demographics | No invasion on MRI, Tsm1/sm2 | mrTsm3/ T2 | mrT3a-T3b | Total |
|---|---|---|---|---|
| Age (year) | ||||
| <65 | 6 | 9 | 7 | 22 |
| ≥65 | 7 | 22 | 14 | 43 |
| Sex | ||||
| Male | 8 | 17 | 15 | 40 |
| Female | 5 | 14 | 6 | 25 |
| Tumour distance from the anal verge | ||||
| ≤6 cm | 6 | 14 | 4 | 24 |
| >6 cm | 7 | 17 | 17 | 41 |
| mr N Stage | ||||
| mrN0 | 13 | 26 | 11 | 50 |
| mrN1-N2 | 0 | 5 | 10 | 15 |
| p N stage | ||||
| pN0 | 3 | 14 | 14 | 31 |
| pN1-N2 | 0 | 7 | 6 | 13 |
| n/a | 10 | 10 | 1 | 21 |
| Type of surgery performed | ||||
| LE | 6 | 5 | 0 | 11 |
| TEMS | 4 | 5 | 1 | 10 |
| AR | 3 | 21 | 18 | 42 |
| Exenteration | 0 | 0 | 2 | 2 |
| Quadrant of rectal wall infiltrated by tumour | ||||
| Anterior | 4 | 7 | 6 | 17 |
| Lateral | 6 | 15 | 12 | 33 |
| Posterior | 3 | 9 | 3 | 15 |
| pT stage | ||||
| Benign adenomas | 4 | 0 | 0 | 4 |
| T1sm1 | 1 | 0 | 0 | 1 |
| T1sm2 | 5 | 4 | 0 | 9 |
| T1sm3 | 2 | 7 | 0 | 9 |
| T2 | 1 | 17 | 4 | 22 |
| T3* | 0 | 0 | 4 | 4 |
| T3a | 0 | 2 | 4 | 7 |
| T3b | 0 | 0 | 5 | 4 |
| T3c | 0 | 1 | 3 | 4 |
| T4 | 0 | 0 | 1 | 1 |
| Total | 13 | 31 | 21 | 65 |
*Missing histopathology data about the depth of tumour invasion into the mesorectum.
AR, anterior resection; LE, local excision; n/a, not applicable (patients were treated with local excision), TEMS, transanal endoscopic microsurgery.